From d1e063beb43e595680c65e3804d1f8ddff53373b Mon Sep 17 00:00:00 2001 From: Guido Guenther Date: Sat, 18 Nov 2006 23:48:07 +0100 Subject: Imported Debian version 0.3.8.8 --- e2fslib/rs_bitmap.c | 107 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 107 insertions(+) create mode 100644 e2fslib/rs_bitmap.c (limited to 'e2fslib/rs_bitmap.c') diff --git a/e2fslib/rs_bitmap.c b/e2fslib/rs_bitmap.c new file mode 100644 index 0000000..30a9ef9 --- /dev/null +++ b/e2fslib/rs_bitmap.c @@ -0,0 +1,107 @@ +/* + * rs_bitmap.c --- routine for changing the size of a bitmap + * + * Copyright (C) 1996, 1997 Theodore Ts'o. + * + * %Begin-Header% + * This file may be redistributed under the terms of the GNU Public + * License. + * %End-Header% + */ + +#include +#include +#if HAVE_UNISTD_H +#include +#endif +#include +#include +#ifdef HAVE_SYS_STAT_H +#include +#endif +#ifdef HAVE_SYS_TYPES_H +#include +#endif + +#include "ext2_fs.h" +#include "ext2fs.h" + +errcode_t ext2fs_resize_generic_bitmap(__u32 new_end, __u32 new_real_end, + ext2fs_generic_bitmap bmap) +{ + errcode_t retval; + size_t size, new_size; + __u32 bitno; + + if (!bmap) + return EXT2_ET_INVALID_ARGUMENT; + + EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_GENERIC_BITMAP); + + /* + * If we're expanding the bitmap, make sure all of the new + * parts of the bitmap are zero. + */ + if (new_end > bmap->end) { + bitno = bmap->real_end; + if (bitno > new_end) + bitno = new_end; + for (; bitno > bmap->end; bitno--) + ext2fs_clear_bit(bitno - bmap->start, bmap->bitmap); + } + if (new_real_end == bmap->real_end) { + bmap->end = new_end; + return 0; + } + + size = ((bmap->real_end - bmap->start) / 8) + 1; + new_size = ((new_real_end - bmap->start) / 8) + 1; + + if (size != new_size) { + retval = ext2fs_resize_mem(size, new_size, + (void **) &bmap->bitmap); + if (retval) + return retval; + } + if (new_size > size) + memset(bmap->bitmap + size, 0, new_size - size); + + bmap->end = new_end; + bmap->real_end = new_real_end; + return 0; +} + +errcode_t ext2fs_resize_inode_bitmap(__u32 new_end, __u32 new_real_end, + ext2fs_inode_bitmap bmap) +{ + errcode_t retval; + + if (!bmap) + return EXT2_ET_INVALID_ARGUMENT; + + EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_INODE_BITMAP); + + bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP; + retval = ext2fs_resize_generic_bitmap(new_end, new_real_end, + bmap); + bmap->magic = EXT2_ET_MAGIC_INODE_BITMAP; + return retval; +} + +errcode_t ext2fs_resize_block_bitmap(__u32 new_end, __u32 new_real_end, + ext2fs_block_bitmap bmap) +{ + errcode_t retval; + + if (!bmap) + return EXT2_ET_INVALID_ARGUMENT; + + EXT2_CHECK_MAGIC(bmap, EXT2_ET_MAGIC_BLOCK_BITMAP); + + bmap->magic = EXT2_ET_MAGIC_GENERIC_BITMAP; + retval = ext2fs_resize_generic_bitmap(new_end, new_real_end, + bmap); + bmap->magic = EXT2_ET_MAGIC_BLOCK_BITMAP; + return retval; +} + -- cgit v1.2.3